package com.zuoye3;

public class SimpleTest {

        public static void main(String[] args) {

            System.out.println(text("aaasdafghjka","aaasdfg"));
        }
        public static String text(String s1,String s2) {

            String max="";String min="";

            max=(s1.length()>s2.length())?s1:s2;

            min=(max==s1)?s2:s1;
            for(int x=0;x<min.length();x++){
                for(int y=0,z=min.length()-x;z<min.length()+1;y++,z++){
                    String temp=min.substring(y, z);
                    if(max.contains(temp))   return temp;
                }
            }
            return null;
        }
    }


